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Title: Spherulite Growth In Poly Propylene Questionnaire Figure (A): Spherulite growth rate (?m/min) in Polypropylene melting at different temperatures. (See Appendices 1.1) 1. Temperature (?C) Spherulite growth rate (?m/min) 130 0.023 128 0.035 126 0.038 124 0.057 2. The observed variation of growth rate with temperature The size shape regularity of the crystals depend on their growth conditions, such factor as temperature and growth rate being important. The thickness of the lamellar depends on the crystallization temperature and any subsequent annealing treatment (Hendra 1976). According to the graph (appendix 2.2) higher the temperature gives lower the spherulite growth rate. However it is clearly observed that spherulite can grow bigger then phase-separated domains in rapid cooling process. 3. Type of nucleation observed Spherulites are recognized by their characteristic appearance in the polarizing microscope, where they are seen as circular birefringrent areas possessing a dark Maltese cross pattern. Spherulite thus appears to represent the crystalline portion of the sample, growing as the expense of the non-crystalline melt. The...

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